Oil and air mixing device



June 12, 1934. H. R. HYLE OIL AND AIR MIXING DEVICE Filed Feb. 19, 1931 2 Sheets-Sheet l INVENTOR HTTORNEY H. R. HYLE 1,962,956

OIL AND AIR MIXING DEVICE Filed Feb. 19, 1931 2 Sheets-Sheet 2 June 12, 1934.

BY Wax/MM (ATTORNEY Patented June 12, 1934 UNITED I STATES ENt oFF c-s 1 Claim.

In oil burners great diflicnlty has been met where small orifices are used in'having the same become choked up by the formation of sedimentation, or from other causes, such as the presence S' of dirt in the oil, thereby causing an unequal 110W or entire stoppage of the oil supply. To overcome this difiiculty is one of the objects of my invention, which I accomplish by the means shown, described and claimed, especially the shape of the orifice and the means for cleaning the same.

Another difficulty found in oil burners is the liability of leakage where numerous fittings are used, or the causing of leaks by rough handling or blows. I have overcome this difficulty to a great extent by enclosing the pump, valves and mixer in a unit casing, and otherwise as hereinafter set forth.

A further object of my invention is providing in this unit casing mentioned and integral therewith, relief valves andoperating valves protected and encased so asto insure the same from injury from external abuse.

a A further object of ,my invention isan improved oil conductingmeans after the same'has been admitted. through the orifices.

A further object of my invention is an improved orifice and'orifice plate in which the same is located.

A further object of my invention is an improved wiper for wiping the orifice.

A further object of'my invention is an im fications can be resorted'to which come within the scope of the claim hereunto appended.

In the drawings of the herein-described embodiment of my invention, Fig. 1 is a front view inelevationoi my improved device; Fig. 2 is a irontview in elevation looking inthesame direction as shown in Fig. 1, partly in section; Fig. 3 is an end view in elevation, partly in section-taken in the direction of arrows 3 in Figs. 1 and 2; Fig. 4 is a sectional view taken through 4-4 of Fig. 2, looking'in the direction of the arrow shown in Fig. 2; Fig. 5 is a face viewof the wiper and orifice plate upon the face of which the wiper operates; Fig. 6 is a, view of the wiper and orifice plate taken at right-angles to the View shown in Fig. 5, and shows the means for maintaining contact between the wiper and the orifice plate; and Fig. 7 is an end View taken .in elevation of mixing pumpcasing 57, showing mixing pump mixing chamber 53'and mixing 1.

pump barrel 54. l

Similar numerals refer to similar parts throughout the several views. 1 is the unit casing in which are located pressure pump structure 2 valves 3 and 4, and wiping element 5.

In unit casing l'is chamber 6 in which chamber is placed pressure pump structure 2; this pump structure with its contained pressure pump may be of any convenient design. As shown, it is-of the gear type, and I will not further describe it,. as nothing is claimed concerning the same as a-' pump. I will, however, describe its connections, which are new. 7 is the exhaustfrom pressure pump structure 2 and exhausts into chamber 6, the suction of the pressure pump structure being. at 8 which is connected to unit casing 1, or rather through the'unit casing 1, by gland nipple 9 screwed into the structure and operating through; packing10' and follower 11. Follower 11"ls secured to unit casing 1 by bolts 12 and to which follower suction pipe 13 is attached.

In unit casing 1 is overflow drain 14Yleading back to the supply tank not shown, andfrom which suction pipe 13 receives its supply, also not shown. Overflow pipe 14 enters chamber 15 in 90 unit casing 1 through valves 3' and 4; chamber 15 as shown is smaller than chamber 6 to provide a shoulder to su'pport'pump structure 2, the said two chambers 6 and 15being connected by duct'l6. I

Valve 3 seats on valve seat 17 formed in unit casing 1 preferably knife-edge surface, and valve preferably being spherical to provide flexibility of' seating and avoidanceof sticking. 18 is a spring held by plug 19 screwing into orifice 2O in--1OO which is located spring 18. Orifice 20 is connected to overflow 14 by duct 21,-thetension-or compressive force of spring 18 is previously determined to give valve 3 the pressure desired to be maintained against the maximum pressure 105 within chamber 15,'this being an emergency re lief. valve and seldom used. Valve 4seats ona knife-edge valve seatformed in. unit casing 1, and operates as a; plunger in pocket22, and is provided with valve. stem 23. 116* Around valve stem 23 in pocket 22 and operating against valve 4, is spring 24 of suificient compression strength to maintain valve 4 seated under the maximum pressure in chamber 15, preferably 5 the same pressure as will unseat valve 3. The exterior movement of valve 4 from pocket 22 is limited by pin 25 in said valve operating through limited opening 26 in the pocket casing 27, which casing is adjustably secured to unit casing 1, as shown, bymeans of a screw thread, said pocket casing being provided with a slot 28 for adjusting purposes. This adjustment is made to permit the ordinary overflow to take place from chamber 15 when the oil pump in casing 2 is operating normally and the normal amount of .oil is being forced through the nozzles hereinafter described. To prevent leakage around casing'27, is stui'fing 29 and screw follower gland 30, 31. being a capto enclose opening 32 in unit casing 1. 33 is a gauge in duct 16, or other conveniently located position, to show the oil pressure within chambers 6 and 15. 34 is a cover for chamber 6 secured by bolts 35.

36 is an intermediate casing providing a proper 2 5 packing means around operating shaft'37, which packing is shown as 38 operating within glands 39 and 40. Gland 40 is provided with slot 41 for setting up, said gland being mounted in intermediate block 36 by being screwed therein, 42 be- 3Q ing a follower nut also provided with a slot 43 for screwing purposes.

Between'intermediate casing 36 and unit casing 1 is located orificeplate 44, which is made oiltight between casings 36and 1 by gaskets on both 3e sides, not shown, constructed preferably of paper *and shellac. In orifice plate 44 as shown are two orifices 45, it being understood, however, that one or any number of orifices may be used as requirements may dictate. These orifices are 10- 40,-,cated, as shown in Figs. 7 and 8, and are very fine knife-edged on the side of chamber 15 and diverge considerably therefrom to facilitate the freeing of the oil and the prevention of clogging. Wiping element 5 operates over these orifices in 45.

" in contact bymeans of spring 46 held in place by washer 4'7 and pin 48' in pump shaft 49, which pin, however, is rigid in pump shaft 49'and opcrates in slots 50 in operating shaft 37, thus form- 5& ing a driving means between the said two shafts. In intermediate casing .36 is a circular duct 51 registering with orifice 45 to conduct oil therefrom into duct 52, which duct leads into mixing pump mixing chamber 53 (see'Fig. 7). 55, 54 is the mixing pump barrel provided with opcrating slots 55 in which function blades 56, which I have found preferable to constructof fiber, and experience has taught that the centrifugal force was sufficient to maintain these blades in contact our with the surface of mixing pump mixing chambe 53, at all parts of the revolution.

57 is the mixing pump casing flange on the intermediate casing 36, and having flanged therein a pump housing 58. In practice, it has been ,found that supporting base 60, housing 58, casings57 and 36 may be secured together as a unit by means of bolts 59 assembled as shown in Fig. 4. '60 is a-supporting base which is flanged over mixing pump housing 58 on to mixing pump cas- 70. ing 57, and is provided with an air inlet 61 which inlet by meansof ducts 62 connects up'with circular duct 63 and from which circular duct air is admitted through orifice 64 in mixing pump housing 58 into mixing pump mixing chamber 53, I

and is located with reference to oil duct 52 on the operating shaft 37 through flexible coupling 81.

contact with orifice plate 44 and are maintained opposite side of said mixing pump chamber 53, whereby the two incoming air and oil enter counterposed.

Air inlet 61 is controlled by needle valve 65,

which valve is provided withordinary stuifing box and follower gland for tightening purposes.

Leading from mixing pump chamber 53 is orifice or discharge 66; discharge 66 is connected to nozzle duct by means ofpipe68 with ordinary union connections. 69 is the nozzle plate or gun base to which is secured nozzle duct on the one side, and the connections of pipe 68 on the other, whereby the mixed oil and. air may be fed through said pipe 68 into nozzle duct, thus forming the base for what is known as the gun.

Referring to Fig. 1, 79 represents the motive power, or motor, which operates fan 80 which is secured to the shaft, and which motor shaft drives On the fan side of pump housing 58 is stufimg box 81', stuffing 82 and follower cap 83.

The operation of my invention is as follows:

' The oil supply coming from the tank to which overflow 14 is attached, is brought in by pipe 13 to pump 2 where it is pumpedunder pressure into chamber 6. Pocket casing 27 in which operates valve 4 is adjusted to permit the excessive oil pumped by pump 2 to be by-passed around valve 4 back into the supply tank through overflow 14, sufiicient pressure, however, being maintained in chamber 6 by this adjustment to permit the ordinary consumption of oil to flow through orifices 45, the flow presumed to be constant and V regulated for a different quantity. In the event that from any cause whatsoever orifices 45 should cease to pass the normal supply of oil, the pressure would build up in chamber 6 and when at its maximum adjusted to pressure valve 4 will open wider by compressing spring 24, permitting more oil to pass said valve 4. V I

As an emergency feature, in the event that pump 2 2 was pumping more oil than could be relieved around valve 4, valve 3 will open as soon as the pressure reaches the maximum allowed.

The oil under pr'essure'in chambers 6 and 15 passes through orifices 45 when uncovered by wipto the shaft, revolves with the same continually wiping the face or knife-edge'of orifices 45, th re- 'by causing the same to clean on the faceside,

and as said orifices practically grow larger from the knife-edgetowards the discharge, there is no tendency to choke, but will be self-cleaning. After going through the orifices the oil is conducted by ducts 51 and 52 into mixing pump mixing chamber 53 whereit meets a stream of air flowing in counterwise through orifice 64 from ducts 62, 63 and air inlet 61. In this chamber the air and oil are mixed, agitated and pumped out through orifice ordischarge 66 and pipe 68.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

An oil and air mixing device comprising a mixing pump casing having an air inlet, a pump rotorin said casing having an operating shaft, an intermediate casing having packing means and locking elementstherefor through which said operating shaft passes, said casing being provided with means for passing oil therethrough-to said mixing pump, aunit casing, an intermediate ori-' fice plate secured between said intermediate casing and said unit casing, said unit casing having therein an oil pump driven by said operating shaft by means of a coupling, said orifice platebeing provided with an orifice, a wipingv means withinliillsaid unit casing driven by said operating shaft intermittently wiping said orifice, said oil pump having a supply therefor through said unit casing by means of a suction pipe packed in said unit casing to prevent leaks, said pump discharging within said unit casing, means provided in said 

